App to Control two App's Audio Level Independently?

[Mike_R]

I'm wondering if anyone knows of an app that will allow me to have different audio level for two apps that are running simultaneously.
For example, I have to be listening to streaming audio from App #1 all day for my work but I want to listen to Pandora simultaneously so I need the volume of Pandora to be quiter than app #1. Is there an app that will allow me to control Pandora's audio level without adjusting the general 'Media Volume'?